Complementary constraints from FR IIb radio galaxies and X-ray gas mass fractions in clusters on non-standard cosmological models

Simple item page
dc.creatorPuetzfeld, Dirk
dc.creatorPohl, Martin
dc.creatorZhu, Zong-Hong
dc.date2004-07-09
dc.date.accessioned2026-07-07T12:59:38Z
dc.date.available2026-07-07T12:59:38Z
dc.descriptionWe use recent measurements of the dimensionless coordinate distances from Fanaroff-Riley Type IIb radio galaxies and the X-ray gas mass fractions in clusters to constrain the parameters of a non-standard cosmological model. This work complements our recent analysis of the SN Ia data within a non-Riemannian cosmological model. We use two independent data sets to constrain the new density parameter $Ω_ψ$, which is related to the non-Riemannian structure of the underlying spacetime and supplements the field equations that are very similar to the usual Friedmann equations of general relativity. Thereby we place an upper limit on the presence of non-Riemannian quantities in the late stages of the universe. The numerical results of this work also apply to several anisotropic cosmological models which, on the level of the field equations, exhibit a similar scaling behavior of the density parameters like our non-Riemannian model.
dc.description22 pages, 6 figures, submitted to ApJ, uses aastex preprint style
dc.identifierhttps://arxiv.org/abs/astro-ph/0407204
dc.identifierhttp://arxiv.org/abs/astro-ph/0407204
dc.identifierAstrophys.J. 619 (2005) 657
dc.identifierdoi:10.1086/426665
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/225636
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleComplementary constraints from FR IIb radio galaxies and X-ray gas mass fractions in clusters on non-standard cosmological models
dc.typetext

Files

Collections

arXiv